WEDNESDAY, Feb. 7, 2018 (HealthDay News) -- Fans around the world were shocked when comedian Robin Williams took his own life in 2014. But the tragedy didn't stop there: Researchers believe his grim death spawned a rash of copycat suicides.

In the five months after Williams hung himself inside his California home, U.S. suicides went up nearly 10 percent, according to a new study.

During that same time period, the rates of death by suffocation (a category that includes hanging) rose by 32 percent. All other methods of suicide went up by 3 percent, the researchers said. The increases were greatest among men aged 30 to 44.

"Suicide is very complex and it arises from a confluence of factors," said study lead author David Fink, of Columbia University's School of Public Health in New York City.

But Fink said when someone like Robin Williams kills himself, the way that death is reported and covered by both traditional and social media may contribute to an increase in suicides.

Dr. Jeffrey Borenstein agreed that hearing about other people's suicides can boost the risk of suicide in vulnerable people.

"Although this study can't make a definitive case for cause and effect, we do know that there's what's referred to as contagion when there's a suicide in the immediate family, in a school or in a community, or by a public figure," Borenstein said. He's president and CEO of the Brain & Behavior Research Foundation in New York City

"Because Robin Williams was such a beloved person publicly, his suicide really received a lot of attention, and that may have increased the risk for other people to attempt suicide," Borenstein added.

Williams was 63 when he died in August 2014. He had a history of depression, but had also been diagnosed with Lewy body dementia. However, his dementia diagnosis wasn't reported at the time of his death, according to researchers.

For the study, researchers reviewed suicide data from 1999 through 2015 in the United States. From August 2014 through December 2014, their statistical analysis projected that there should be just under 17,000 suicides. Instead, there were just under 18,700 suicides. That meant there were more than 1,800 unexpected suicides during that time.

The study authors noted that when Kurt Cobain, the lead singer of the band Nirvana, died by suicide in 1994, there wasn't a similar spike in suicides. They said this may be because Cobain's death was reported in a less sensational manner with few details provided -- at least initially. Also, social media wasn't as widespread as it is now.

Whatever the reason behind the increase found in the new study, Borenstein said it's important to remember that anyone who attempts suicide or dies by suicide has a psychiatric condition that is treatable.

"Some people think it's dangerous to talk about suicide and they're afraid to say anything about it. Yet studies have shown that bringing it up is the safe thing to do. Then people can assist their loved one in receiving appropriate treatment," Borenstein said.

"If your loved one is saying things like 'I wish I were dead,' this is an emergency. If you saw them clutching their chest, you'd call 911. This is the same type of emergency," he added.

Warning signs of suicide include:

Talking about wanting to die.

Looking for a way to kill oneself.

Feeling hopeless, having no purpose or being a burden to others.

Feeling trapped or in unbearable pain.

Increased use of drugs or alcohol.

Acting anxious, agitated or reckless.

Sleeping too little or too much.

Withdrawing from friends and family.

Seeking revenge or showing rage.

Displaying extreme mood swings.

If someone you know exhibits these signs, don't leave the person alone. Remove anything that could be used in a suicide attempt (such as firearms or drugs). Call the national suicide prevention hotline at 800-273-TALK (8255), or take him or her to the nearest emergency room.

SOURCES: David S. Fink, M.P.H., M.Phil., department of epidemiology, Columbia University Mailman School of Public Health, New York City; Jeffrey Borenstein, M.D., president and CEO, Brain & Behavior Research Foundation, New York City; Feb. 7, 2018, PLOS One, online

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